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Unthank等人曾指出,含Cr高的奥氏体不锈钢在600～800℃氮化时,将沿晶界形成大量的CrN,并可能导致沿晶开裂,造成氮化层剥落.Kindlimann和Ansell认为,氮化表面上Fe或Ni-Fe的氮化物增到一定厚度时将产生“白亮层”,冷却时可能剥落。高濑孝夫在讨论氮化温度对18-8钢氮化层脆性影响时指出,低温氮化易出现氮化层剥落。本工作通过氮化前对试样作适当的预先热处理找到了解决氮化层剥落的方法,并探明了氮化层剥落的原因。
Unthank et al. Have pointed out that austenitic stainless steels containing Cr form a large amount of CrN along grain boundaries when nitrided at 600-800 ° C and may cause intergranular cracking leading to peeling of the nitride layer.Kindlimann and Ansell argue that, Nitriding on a nitrided surface increases the thickness of a layer of Fe or Ni-Fe to produce a “white layer” that may peel off as it cools. When discussing the effect of nitriding temperature on brittleness of nitrided layer of 18-8 steel, Takase Takau said that it is easy for nitrided layer to peel off at low temperature. This work by nitriding before the sample for the appropriate pre-heat treatment to find a solution to the nitride layer spalling method and proved the nitride layer spalling reasons.